arch/alpha/kernel/irq_alpha.c

   1 /*
   2  * Alpha specific irq code.
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/sched.h>
   7 #include <linux/irq.h>
   8 #include <linux/kernel_stat.h>
   9 #include <linux/module.h>
  10
  11 #include <asm/machvec.h>
  12 #include <asm/dma.h>
  13 #include <asm/perf_event.h>
  14 #include <asm/mce.h>
  15
  16 #include "proto.h"
  17 #include "irq_impl.h"
  18
  19 /* Hack minimum IPL during interrupt processing for broken hardware.  */
  20 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
  21 int __min_ipl;
  22 EXPORT_SYMBOL(__min_ipl);
  23 #endif
  24
  25 /*
  26  * Performance counter hook.  A module can override this to
  27  * do something useful.
  28  */
  29 static void
  30 dummy_perf(unsigned long vector, struct pt_regs *regs)
  31 {
  32         irq_err_count++;
  33         printk(KERN_CRIT "Performance counter interrupt!\n");
  34 }
  35
  36 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
  37 EXPORT_SYMBOL(perf_irq);
  38
  39 /*
  40  * The main interrupt entry point.
  41  */
  42
  43 asmlinkage void
  44 do_entInt(unsigned long type, unsigned long vector,
  45           unsigned long la_ptr, struct pt_regs *regs)
  46 {
  47         struct pt_regs *old_regs;
  48         switch (type) {
  49         case 0:
  50 #ifdef CONFIG_SMP
  51                 handle_ipi(regs);
  52                 return;
  53 #else
  54                 irq_err_count++;
  55                 printk(KERN_CRIT "Interprocessor interrupt? "
  56                        "You must be kidding!\n");
  57 #endif
  58                 break;
  59         case 1:
  60                 old_regs = set_irq_regs(regs);
  61 #ifdef CONFIG_SMP
  62           {
  63                 long cpu;
  64
  65                 local_irq_disable();
  66                 smp_percpu_timer_interrupt(regs);
  67                 cpu = smp_processor_id();
  68                 if (cpu != boot_cpuid) {
  69                         kstat_incr_irqs_this_cpu(RTC_IRQ, irq_to_desc(RTC_IRQ));
  70                 } else {
  71                         handle_irq(RTC_IRQ);
  72                 }
  73           }
  74 #else
  75                 handle_irq(RTC_IRQ);
  76 #endif
  77                 set_irq_regs(old_regs);
  78                 return;
  79         case 2:
  80                 old_regs = set_irq_regs(regs);
  81                 alpha_mv.machine_check(vector, la_ptr);
  82                 set_irq_regs(old_regs);
  83                 return;
  84         case 3:
  85                 old_regs = set_irq_regs(regs);
  86                 alpha_mv.device_interrupt(vector);
  87                 set_irq_regs(old_regs);
  88                 return;
  89         case 4:
  90                 perf_irq(la_ptr, regs);
  91                 return;
  92         default:
  93                 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
  94                        type, vector);
  95         }
  96         printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
  97 }
  98
  99 void __init
 100 common_init_isa_dma(void)
 101 {
 102         outb(0, DMA1_RESET_REG);
 103         outb(0, DMA2_RESET_REG);
 104         outb(0, DMA1_CLR_MASK_REG);
 105         outb(0, DMA2_CLR_MASK_REG);
 106 }
 107
 108 void __init
 109 init_IRQ(void)
 110 {
 111         /* Just in case the platform init_irq() causes interrupts/mchecks
 112            (as is the case with RAWHIDE, at least).  */
 113         wrent(entInt, 0);
 114
 115         alpha_mv.init_irq();
 116 }
 117
 118 /*
 119  * machine error checks
 120  */
 121 #define MCHK_K_TPERR           0x0080
 122 #define MCHK_K_TCPERR          0x0082
 123 #define MCHK_K_HERR            0x0084
 124 #define MCHK_K_ECC_C           0x0086
 125 #define MCHK_K_ECC_NC          0x0088
 126 #define MCHK_K_OS_BUGCHECK     0x008A
 127 #define MCHK_K_PAL_BUGCHECK    0x0090
 128
 129 #ifndef CONFIG_SMP
 130 struct mcheck_info __mcheck_info;
 131 #endif
 132
 133 void
 134 process_mcheck_info(unsigned long vector, unsigned long la_ptr,
 135                     const char *machine, int expected)
 136 {
 137         struct el_common *mchk_header;
 138         const char *reason;
 139
 140         /*
 141          * See if the machine check is due to a badaddr() and if so,
 142          * ignore it.
 143          */
 144
 145 #ifdef CONFIG_VERBOSE_MCHECK
 146         if (alpha_verbose_mcheck > 1) {
 147                 printk(KERN_CRIT "%s machine check %s\n", machine,
 148                        expected ? "expected." : "NOT expected!!!");
 149         }
 150 #endif
 151
 152         if (expected) {
 153                 int cpu = smp_processor_id();
 154                 mcheck_expected(cpu) = 0;
 155                 mcheck_taken(cpu) = 1;
 156                 return;
 157         }
 158
 159         mchk_header = (struct el_common *)la_ptr;
 160
 161         printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
 162                machine, vector, get_irq_regs()->pc, mchk_header->code);
 163
 164         switch (mchk_header->code) {
 165         /* Machine check reasons.  Defined according to PALcode sources.  */
 166         case 0x80: reason = "tag parity error"; break;
 167         case 0x82: reason = "tag control parity error"; break;
 168         case 0x84: reason = "generic hard error"; break;
 169         case 0x86: reason = "correctable ECC error"; break;
 170         case 0x88: reason = "uncorrectable ECC error"; break;
 171         case 0x8A: reason = "OS-specific PAL bugcheck"; break;
 172         case 0x90: reason = "callsys in kernel mode"; break;
 173         case 0x96: reason = "i-cache read retryable error"; break;
 174         case 0x98: reason = "processor detected hard error"; break;
 175
 176         /* System specific (these are for Alcor, at least): */
 177         case 0x202: reason = "system detected hard error"; break;
 178         case 0x203: reason = "system detected uncorrectable ECC error"; break;
 179         case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
 180         case 0x205: reason = "parity error detected by core logic"; break;
 181         case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
 182         case 0x207: reason = "non-existent memory error"; break;
 183         case 0x208: reason = "MCHK_K_DCSR"; break;
 184         case 0x209: reason = "PCI SERR detected"; break;
 185         case 0x20b: reason = "PCI data parity error detected"; break;
 186         case 0x20d: reason = "PCI address parity error detected"; break;
 187         case 0x20f: reason = "PCI master abort error"; break;
 188         case 0x211: reason = "PCI target abort error"; break;
 189         case 0x213: reason = "scatter/gather PTE invalid error"; break;
 190         case 0x215: reason = "flash ROM write error"; break;
 191         case 0x217: reason = "IOA timeout detected"; break;
 192         case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
 193         case 0x21b: reason = "EISA fail-safe timer timeout"; break;
 194         case 0x21d: reason = "EISA bus time-out"; break;
 195         case 0x21f: reason = "EISA software generated NMI"; break;
 196         case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
 197         default: reason = "unknown"; break;
 198         }
 199
 200         printk(KERN_CRIT "machine check type: %s%s\n",
 201                reason, mchk_header->retry ? " (retryable)" : "");
 202
 203         dik_show_regs(get_irq_regs(), NULL);
 204
 205 #ifdef CONFIG_VERBOSE_MCHECK
 206         if (alpha_verbose_mcheck > 1) {
 207                 /* Dump the logout area to give all info.  */
 208                 unsigned long *ptr = (unsigned long *)la_ptr;
 209                 long i;
 210                 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
 211                         printk(KERN_CRIT "   +%8lx %016lx %016lx\n",
 212                                i*sizeof(long), ptr[i], ptr[i+1]);
 213                 }
 214         }
 215 #endif /* CONFIG_VERBOSE_MCHECK */
 216 }
 217
 218 /*
 219  * The special RTC interrupt type.  The interrupt itself was
 220  * processed by PALcode, and comes in via entInt vector 1.
 221  */
 222
 223 struct irqaction timer_irqaction = {
 224         .handler        = timer_interrupt,
 225         .flags          = IRQF_DISABLED,
 226         .name           = "timer",
 227 };
 228
 229 void __init
 230 init_rtc_irq(void)
 231 {
 232         irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
 233                                       handle_simple_irq, "RTC");
 234         setup_irq(RTC_IRQ, &timer_irqaction);
 235 }
 236
 237 /* Dummy irqactions.  */
 238 struct irqaction isa_cascade_irqaction = {
 239         .handler        = no_action,
 240         .name           = "isa-cascade"
 241 };
 242
 243 struct irqaction timer_cascade_irqaction = {
 244         .handler        = no_action,
 245         .name           = "timer-cascade"
 246 };
 247
 248 struct irqaction halt_switch_irqaction = {
 249         .handler        = no_action,
 250         .name           = "halt-switch"
 251 };